Make isimag return false for real numbers that are zero.

JuliaLang · Jan 8, 2017 · 3fc38cc · 3fc38cc
1 parent 95072cd
commit 3fc38cc
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Showing 2 changed files with 5 additions and 1 deletion.
diff --git a/base/complex.jl b/base/complex.jl
@@ -92,7 +92,8 @@ isreal(z::Complex) = iszero(imag(z))
 
 Test whether `z` is purely imaginary, i.e. has a real part equal to 0.
 """
-isimag(z::Number) = iszero(real(z))
+isimag(z::Real) = false
+isimag(z::Complex) = iszero(real(z))
 isinteger(z::Complex) = isreal(z) & isinteger(real(z))
 isfinite(z::Complex) = isfinite(real(z)) & isfinite(imag(z))
 isnan(z::Complex) = isnan(real(z)) | isnan(imag(z))

diff --git a/test/complex.jl b/test/complex.jl
@@ -969,3 +969,6 @@ end
 
 # issue #19240
 @test big(1)/(10+10im) ≈ (5-5im)/big(100) ≈ big"0.05" - big"0.05"*im
+
+# Test that isimag yields false for real numbers that are zero
+@test !isimag(0)